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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
3701
CALL
La-Z-Boy
LZB
$1.3B
| $448K | ﹤0.01% |
15,100
+300
| +2% | +$10.8K |
2026 Q2
1 quarter
|
|
3702
CALL
Atlas Lithium Corp
ATLX
$49.8M
| $448K | ﹤0.01% |
177,600
+153,400
| +634% | +$470K |
2023 Q4
11 quarters
|
|
3703
Velocity Financial
VEL
$621M
| $448K | ﹤0.01% |
29,794
+24,341
| +446% | +$426K |
2026 Q2
1 quarter
|
|
3704
Leverage Shares 2X Long SNDK Daily ETF
SNDG
$17.4M
| $447K | ﹤0.01% |
+43,096
| New | +$423K |
2026 Q3
0 quarters
|
|
3705
Omeros
OMER
$1.26B
| $447K | ﹤0.01% |
23,469
+14,610
| +165% | +$221K |
2025 Q3
4 quarters
|
|
3706
The RealReal
REAL
$1.75B
| $447K | ﹤0.01% |
+50,518
| New | +$546K |
2026 Q3
0 quarters
|
|
3707
CALL
3D Systems Corp
DDD
$261M
| $446K | ﹤0.01% |
123,800
+49,700
| +67% | +$159K |
2014 Q4
47 quarters
|
|
3708
CALL
Itaú Unibanco
ITUB
$83B
| $445K | ﹤0.01% |
52,200
+8,700
| +20% | +$70.2K |
2014 Q4
47 quarters
|
|
3709
Arch Capital
ACGL
$36B
| $445K | ﹤0.01% |
+4,815
| New | +$477K |
2026 Q3
0 quarters
|
|
3710
Agilon Health
AGL
$1.86B
| $444K | ﹤0.01% |
5,584
-9
| -0.2% | -$876 |
2024 Q3
8 quarters
|
|
3711
PUT
Fox Class B
FOX
$25.4B
| $444K | ﹤0.01% |
7,200
-18,400
| -72% | -$1.02M |
2019 Q2
29 quarters
|
|
3712
PUT
Rayonier Advanced Materials
RYAM
$366M
| $444K | ﹤0.01% |
55,700
-2,100
| -4% | -$17.6K |
2025 Q1
6 quarters
|
|
3713
PUT
RUM Group Inc
RUM
$2.2B
| $444K | ﹤0.01% |
58,700
+23,500
| +67% | +$174K |
2021 Q4
19 quarters
|
|
3714
CALL
Chimera Investment
CIM
$541M
| $443K | ﹤0.01% |
46,500
-77,100
| -62% | -$916K |
2018 Q1
34 quarters
|
|
3715
CALL
OneMain Financial
OMF
$6.28B
| $443K | ﹤0.01% |
8,000
+100
| +1% | +$6.16K |
2021 Q2
21 quarters
|
|
3716
CALL
NN Inc
NNBR
$277M
| $442K | ﹤0.01% |
120,500
-9,900
| -8% | -$35.2K |
2026 Q1
2 quarters
|
|
3717
CALL
Tandem Diabetes Care
TNDM
$1.37B
| $442K | ﹤0.01% |
27,100
+1,600
| +6% | +$30K |
2018 Q2
33 quarters
|
|
3718
Box
BOX
$5.98B
| $441K | ﹤0.01% |
13,181
+8,087
| +159% | +$260K |
2026 Q1
2 quarters
|
|
3719
Ventas
VTR
$47.3B
| $440K | ﹤0.01% |
5,181
-3,121
| -38% | -$286K |
2025 Q2
5 quarters
|
|
3720
PUT
Vulcan Materials
VMC
$35.8B
| $440K | ﹤0.01% |
1,800
+1,600
| +800% | +$435K |
2026 Q1
2 quarters
|
|
3721
Cellebrite
CLBT
$2.94B
| $440K | ﹤0.01% |
39,094
+36,980
| +1,749% | +$492K |
2025 Q2
5 quarters
|
|
3722
HDFC Bank
HDB
$134B
| $440K | ﹤0.01% |
19,694
-19,951
| -50% | -$474K |
2025 Q4
3 quarters
|
|
3723
PUT
StoneCo
STNE
$1.79B
| $440K | ﹤0.01% |
47,100
+40,100
| +573% | +$413K |
2019 Q1
30 quarters
|
|
3724
PUT
NNN REIT
NNN
$7.93B
| $440K | ﹤0.01% |
10,700
+7,200
| +206% | +$329K |
2018 Q4
31 quarters
|
|
3725
Franklin Templeton
BEN
$18.3B
| $440K | ﹤0.01% |
13,686
+570
| +4% | +$19.2K |
2026 Q2
1 quarter
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.